netdev - Re: [patch net-next 1/2] ip6_output: fragment outgoing reassembled skb properly

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Date:	Fri, 8 Nov 2013 08:52:01 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, pablo@...filter.org,
	netfilter-devel@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	kadlec@...ckhole.kfki.hu, kaber@...sh.net, mleitner@...hat.com,
	kuznet@....inr.ac.ru, jmorris@...ei.org, wensong@...ux-vs.org,
	horms@...ge.net.au, ja@....bg, edumazet@...gle.com,
	pshelar@...ira.com, jasowang@...hat.com,
	alexander.h.duyck@...el.com, fw@...len.de
Subject: Re: [patch net-next 1/2] ip6_output: fragment outgoing reassembled
 skb properly

Fri, Nov 08, 2013 at 12:54:53AM CET, davem@...emloft.net wrote:
>From: Jiri Pirko <jiri@...nulli.us>
>Date: Wed,  6 Nov 2013 17:52:19 +0100
>
>> If reassembled packet would fit into outdev MTU, it is not fragmented
>> according the original frag size and it is send as single big packet.
>> 
>> The second case is if skb is gso. In that case fragmentation does not happen
>> according to the original frag size.
>> 
>> This patch fixes these.
>> 
>> Signed-off-by: Jiri Pirko <jiri@...nulli.us>
> ...
>
>>  	if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
>> -	    dst_allfrag(skb_dst(skb)))
>> +	    dst_allfrag(skb_dst(skb)) ||
>> +	    (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
>>  		return ip6_fragment(skb, ip6_finish_output2);
>
>Jiri are you sure that you don't need to take GSO into account in the
>new part you are adding to the test?


For gso skb, we need co cap outgoing fragments by the original frag size
as well. So I believe that this code is correct for that case as well.

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